Application research of electrical parameter fast measurement technology in double power automatic switch system

Four points fast measurement is applied in measuring power network parameters of double power automatic switch system. Relative formula of network voltage, current, frequency, and power are calculated. The accuracy of this measuring technology is proved theoretically. Defect of special sampling point is analyzed, relationship of sampling points intervals and measuring error with exist of harmonic acquired, optimal selection of sampling points and period conducted. Starting from practical double switch, with the use of ARM LPC2318 and MAX125, 4 points fast measurement for ac sampling circuit of intelligent double power switch system is realized, and practical programming proceeded. Applying the method in microcomputer measuring of power network parameters in double power automatic switch system can yield good results.